kbuild: show warning if 'make headers_check' is used
Since commit 7ecaf069 ("kbuild: move headers_check rule to usr/include/Makefile"), 'make headers_check' is no-op. This stub target is remaining here in case some scripts still invoke it. In order to prompt people to remove stale code, show a noisy warning message if used. The stub will be really removed after the Linux 5.15 release. Signed-off-by:Masahiro Yamada <masahiroy@kernel.org>
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805b2e1d
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